Unlock instant, AI-driven research and patent intelligence for your innovation.

High-precision synchronous clock correction method and system

A synchronous clock and high-precision technology, which is applied in the correction of synchronization errors, synchronization devices, transmission systems, etc., can solve problems such as strong background noise, narrow bandwidth, and affecting the accuracy of underwater acoustic positioning signal delay estimation.

Active Publication Date: 2020-09-01
SHANGHAI ACOUSTICS LAB CHINESE ACADEMY OF SCI
View PDF3 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The ocean acoustic channel is a typical time-frequency dual-spread channel, which is characterized by narrow bandwidth, large Doppler shift and strong background noise, which seriously affects the accuracy of time delay estimation of underwater acoustic positioning signals.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • High-precision synchronous clock correction method and system
  • High-precision synchronous clock correction method and system
  • High-precision synchronous clock correction method and system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0079] S1: Fix the underwater equipment underwater to ensure that the position of the underwater equipment is fixed without shifting, and at the same time set the working mode of the underwater equipment to synchronous mode, and periodically emit underwater acoustic signals.

[0080] Specifically, in this embodiment, before the synchronous clock is corrected, it is necessary to arrange the surface equipment and the underwater equipment, and fix the underwater equipment underwater.

[0081] Set the working mode of the underwater equipment to synchronous mode, and periodically emit acoustic signals, specifically: configure a timer on the underwater equipment, and set the timer according to the preset synchronization period. A timing time, through which the timer is used to control the underwater device to periodically send the underwater acoustic signal.

[0082] S2: Use high-precision differential GPS to obtain the time reference and geodetic coordinates of the surface equipmen...

Embodiment 2

[0104] like Figure 7 Shown is the overall flowchart of a high-precision synchronous clock correction system of the present invention, including: underwater acoustic signal transmission module 1, time delay estimation module 2, linear model establishment module 3, correction parameter calculation module 4, time delay correction Module 5;

[0105] The underwater acoustic signal transmitting module 1 is used to fix the underwater equipment underwater to ensure that the position of the underwater equipment is fixed without deviation, and at the same time, the working mode of the underwater equipment is set to a synchronous mode. Sexual emission of underwater acoustic signals;

[0106] The time delay estimation module 2 is used to obtain the time reference and geodetic coordinates of the surface equipment by using high-precision differential GPS, and use the generalized cross-correlation algorithm to monitor the underwater acoustic signal sent by the underwater equipment in real ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to the technical field of synchronous clock correction, and provides a high-precision synchronous clock correction method and system, and the method comprises the steps: S1, setting underwater equipment to be in a synchronous mode, and periodically transmitting an underwater acoustic signal; S2, acquiring a time reference and geodetic coordinates of the water surface equipment, monitoring an underwater acoustic signal of the underwater equipment in real time by adopting a generalized cross-correlation algorithm, and estimating time delay; S3, establishing a clock model ofthe underwater equipment as a linear model; S4, calibrating the underwater equipment by utilizing the geodetic coordinates of the water surface equipment, adding a clock correction model correction amount as a clock correction parameter to form a nonlinear equation set, and calculating a correction parameter; and S5, correcting the time delay of the underwater equipment, calibrating the underwater equipment again, completing the estimation of the slope distance error, and counting the distribution characteristics of the slope distance error. The problem that the time delay estimation precision of underwater acoustic positioning signals is affected due to the fact that existing ocean sound adopts a time-frequency double-extended channel, the bandwidth is narrow, Doppler frequency shift islarge and background noise is high is solved.

Description

technical field [0001] The invention relates to the technical field of synchronous clock correction, in particular to a high-precision synchronous clock correction method and system, which is especially suitable for clock synchronization between surface equipment and underwater equipment in an underwater acoustic environment. Background technique [0002] With the development of new marine technologies, marine geophysical prospecting, marine mineral mining, and underwater reference point construction all require high-precision positioning and navigation systems. The accuracy of underwater positions is required to be better than decimeters and reach centimeters. A high-precision positioning and navigation system needs to solve the position installation error, sound velocity error and time delay estimation error. Among them, the high-precision time delay estimation requires complete synchronization between the surface positioning system and the underwater equipment, and the sy...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): H04L7/00H04B13/02G01S11/14
CPCH04L7/0016H04B13/02G01S11/14
Inventor 李记龙王雪琰冯海泓黄敏燕
Owner SHANGHAI ACOUSTICS LAB CHINESE ACADEMY OF SCI
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com